Pump mechanism for stereotype-printing-plate-casting machines.



H. A. w. woon. PUMP MECHANISM FOR STEREOTYPE PRINTING PLATE CASTING MACHINES.

APPLICATION FILED SEPT-4.1M!)- 8 u M M 5 m 9v m 6 n a m T/ v Nw I u v "m i 4 m .I mm ww w vv m m fin Q 1 H- I 1 I I n r 9w I a mm .u V W. QN o 0 NW N6 M4 0 0 0 GM V b? g 9v m mm Q umw mw NW H. A. W. WOOD. PUMP MECHANISM FOR STEREOTYPE PRINTING PLATE CASHNG MACHINES.

APPLICAHOR FILED SEPT-4. 1M5- 3 SHEETS-SHEET 2- N (Q m j N n (a; 0) 'Q r N N N w m AN Ch 0 N O 0 an N :1 2 O) O I Q) N a; Q N Iii onion- Env y4ML1-oh 0od. .Byfliiuv SMMMW Patented Mar. 19, 1918.

H. A. W. WOOD. PUNIP MECHANISM FOR STEREDTYPE PRINTING PLATE CASTING MACHINES.

APPLICATION men SEPTA. I915.

1,259,947. Patented Mar. 19. 1918.

3 SHEET$SIIEET 3.

WWW

UNITED STATES PATENT OFFICE.

HENRY A. WISE WOOD, 01 NEW YORK, N. Y.,

ASSIGNOR TO WOOD NEWSPAPER MACHIN- EBY CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF VIRGINIA.

PUMP HEOHANISM FOB STEREOTYPE-PRINTING-PLATE-CAS'IING MACHINES.

Specification of Letters Patent.

Patented Mar. 19, 1918.

Original application filed January 12, 1910, Serial No. 537,700. Divided and this-application filed September 4, 1915. Serial No. 48,984.

To all whom it may concern:

Be it known that I, HENRY A. WISE WOOD, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a new and useful Pump Mechanism for Stereotype-Printing-PlateCasting Machines, of which the following is a specification.

This is a division of my application Serial No. 537,700, filed Jan. 12, 1910, patented December 14, 1915, No. 1,164,607.

Among the objects of the invention are to provide a melting pot having a recess to contain the pump so as to overcome the pull due to contraction of the body of the metal in the pot due to cooling; to provide means for operating the pump valve so that it shall be automatically closed by the first part of the upward movement of the pump plunger unless it is held 0 en by means controlled by the matrix or ummy matrix; to provide means whereby if one or more of the matrices or dummy matrices have their corners cut away under the pump valve trip device, the pump valve Wlil remain open and no plates will be cast; and to provide a mold adapted to be resiliently held'against the pump nozzle to allow of expansion and contraction of the parts so as to keep the mold and pump nozzle in proper relation to each other, thereby preventing leakage of metal. The invention also involves improve ments in various details of construction as will appear hereinafter.

Reference is to be had in drawings,'in which Tigure 1 is a plan of a map for a flat stereotype plate casting mac ine constructed in accordance with this invention;

Fig. 2 is a side elevation of the same with parts removed; 7

Fig. 3 is a sectional view on the line 3-3 of Fig. 1;

Fig. 4' is a section of a detail;

Fig. Sis an end view of the mold, partly in section;

6 is a longitudinal sectional view of the melting pot and casting pump showing other features in elevation Fig. 7 is an elevation of th thereof.

This invention is shown in a form for casting stereotype plates and as embodying to the accompanyand e casting mouth a frame 3 having means for supporting various parts of the machine. A longitudinal shaft 4 is shown at the front side of the machine, which can be called the driving shaft. I

A reciprocatory supporting plate 91 is mounted to move in vertical guides '92 on the frame, and carries the lower castin box 93. The supporting plate 91 is raised by a cam 6 on the shaft 4 which operates an arm 7 pivoted on a bracket and provided with a connecting rod 8 extending back toward the center ot the machine. With this latter rod is pivotally connected an arm 9 on a rock shaft 10 which is provided with another arm 11, these parts constituting in effect a bell-crank. The arm 11 is pivotally connected with a connecting rod 12 which is pivoted to the bottom of the plate 91. On the frame is mounted a bracket 13 rovided with an adjustable stop 14 for limiting the motion of the connection between the parts 11 and 12 and preventing them from going supported from the rods by plates 28. n

the rods are springs 23' bearing on he plates 23 nearest the ,melting pot, and on collars 15 fixed to the rods. These springs obviously tend to keep the upper box yieldingly against the nozzle. The lower box 93 is held up against the nozzle by a spring 16 operating a rock shaft 17 which is provided with an arm 18 engaging the end of the box. This allows for expansion and contraction and keeps the boxes in proper relation to t pump nozzle so as to prevent leakage.

Through the bases of the plates 23 pass thimbles 19 which extend slightly below the bottom thereof. A bolt 24 extends through each thimble and these bolts fasten the upper box to the standards 21. The thimbles rest on the distance piece 33 by which the elevation of the upper box is controlled. This construction permits the springs 23 to keep the upper box up against the nozzle. The rod 22 rests in open slots on the brackets 21.

Mounted in a vertical guide 25 on the u per section of the casting box is a pin 6 95 is supported on which projects down through into the casting box so that as the lower section of the box moves up, if the matrix M is in position, the matrix will engage the bottom of the pin and raise it enough to move sperm 2? which is mounted on a rock shaft 28. If, however. the corner of the matrix or dummy matrix is cut away, the parts can be moved up into casting position without moving the pin so that this shaft will not be operated. When this shaft is turned by the proper closing of the box containing a complete matrix and adapted to receive metal. this causes a latch 29 thereon to be moved from the path of the top of a vertical rod 30 having a valve 31 thereon; but if the parts operate with a dummy matrix in position which has the rear left-hand corner cut away, the latch 29 will remain over the top of the rod 30 and hold the latter down. The object of this construction will be seen from the following description of the operation of the pump.

On the shaft 4 is a cam operating a. roller 41 on a spring ressed arm 42 which is fixed on a rock she. I; 43. This rock shaft operates an arm 44 which reciprocates a pump plunger 45 in a melting pot 46. This plunger is mounted in an openbottomed cylinder 47 submerged in the pot and the cylinder is located in a recess within a perforated wall 48 in the pot to 1protect; the pump against the tension or pul due to the contraction of the body of metal in the pot upon cooling. Now each rotation. of the cam 40 will move the plunger through a complete reciprocation in the ump cylinder. The upward reciprocation of the plunger will force metal upwardly throu h the nozzle 49 into the mold unless theva ve 31 is held down by the latch 29 asabove ex- ;plained. Then the reciprocation of the plunger will only cause a circulation of the meta in the pump up throu h the passage 50 which the valve 3 controls.

It will be seen therefore, that the pump valve 31 is closed by the first part of the upward movement of the pump plunger on account of the tendency of the metal raised thereby to flow out of the opening 50 unless the valve is held down by the latch, so that if one or more of the matrices or dummy matrices in the mold have their corners cut away all the parts of the pump will operate but the metal will not be forced into the casting box.

If it is desired to keep the valve 31 down all the time so that no metal can be forced from the pump, as for instance while repairing machinery, the rock shaft 28 is turned to brings catch 52 over a fixed collar 53 on the rod 30. This can be done by pulling up on the arm 27 when in the position shown in Figs. 2 and 5. The parts will remain in this position and the machine can be operated without danger of flooding the parts with metal.

The nozzle of the pump is provided with a slot 55 of a width in proper proportion to the width If the mold cavity in the casting box. The hei ht of the slot is regulatet by the position 0 a top part 56 held in ac justable osition by bolts 5" passed through elongated orifices therein. Both the to and bottom members of the end of the nozz e are shown as cooled by air passing through pas- 58. This is provided to cause the metal to chill at the proper place between the plate and the body of metal left in the nozzle.

An arm 64 is keyed on the shaft 43 and connected with the lever 44 by a pin 62 at a distance from the point at which the latter is freely pivoted on the shaft. This pin is provided with a reduced cross section so that in case of any obstruction to the proper operation of the machine suflicient to cause breakage, the breakage will occur at this point. In this case the breaking point is located between the end of the arm 64 and a boss 65 on the lever 44.

When the casting boxes close another plate will be cast from the same matrix unless another one or a dummy is fed into the lower casting box while inlowest osition. In that case the old matrix wil be forced out of the box by the rear matrix guided by the end gages and drop at the rear o "the frame.

When it is desired to operate the machine one (r a. definite number of times without casting a plate, oneor more, dummy matrices with their corners cut away are placed in the mold under the end 2 8 which hold its edges on the ,lower casting box. Then the latter rises, lifts the top Section a very slight distance and brings the arts into registration with the nozzle res. y for the casting of a plate. At this time the spring 60 has brought the rock shaft 43 around into such position as to raise the plunger in the pot, which closes the valve and thus forces the metal into the casting box, with a yielding pressure. The spring continues to exert a pressure on the plunger while the metal is cooling in the mold to compensate for the contraction of the metal. The cams have suliicient dwell at this point to allow the casting box to remain closed long enough to allow the plate to harden. Then the lower box moves down. The upper box remains substantially in the first position. The way in which the pump is prevented from operating is exceedingly simple and effective and of course results in allowing the other operations of the machine to take place wlthout casting a plate, as for example. at the end of any continuous casting operation a dummy would be introduced so as to permit the last matrix to be delivered.

The unions mechanisms are adjustable in all necessary ways to take care of plates of different sizes.

While I have illustrated and described a preferred embodiment of the invention and shown it as applied to the casting of flat printing plaos, I am awar that many modifical ions can be made in the various details of (,AlllStI'llClLlOn and the sequence of operations and that most of the parts can be employed for casting stereotype plates, and in fact other articles, of dificrent shape and character from the plates specified. Therefore, I do not wish to limit myself to the details of construction or Sequence of operations or shape of plates described herein, but what I do claim is 1. In a stereotype plate casting machine, the combination of a pump, a lever for operating the pump, a rock shaft on which said lever is loosely pivoted, and an arm fixed on said rock shaft, and a in connected with said arm and with said ever at a distance.

from the rock shaft, said pin having a reduced cross-section.

2. In a melting pot and pump, the combination of a pump cylinder, and a wall in a wall in the pot surrounding said 0 linder and piston and having perforations t rough the bottom thereof for overcoming the pull due to the contraction of the body of metal in the pot by cooling.

4. In a melting pot for casting purposes, the combination of a pump having a nozzle provided with a long narrow slot, and a plate forming the upper boundary of the slot adjustable in a direction transverse to the long dimension of said slot.

5. The combination of a pump comprising a piston, a cylinder, and a valve, said valve being, in position to be closed by the working stroke of the piston and to render the pump inoperative when held open, means adapted to hold the valve open, and means for preventing the operation of said valve holding means.

6. In a stereotype plate casting machine, the combination of mold filling devices, a shaft, an arm fixed on said shaft, a lever loose on the shaft, means for transmitting power to the shait, and a pin connecting said arm and lever and having a reduced cross-section adapted to break in case of obstruction before any other part of the machine is injured.

In testimony whereof I have hereunto set my hand.

HENRY A. WISE WOOD. 

